An adaptive clipping method, apparatus and electronic device

Abstract

The application provides a self-adaptive limiting method and device and electronic equipment, and relates to the technical field of power supply control. The method comprises the following steps: determining a voltage error according to a voltage given value and a voltage feedback value; compensating the voltage error through a compensator to obtain a compensation output value; limiting the compensation output value to a preset interval through a limiter to obtain a limiting result; and taking the limiting result as an output lower limit value of a voltage outer loop controller to realize full-condition voltage stabilization performance.

Description

Technical Field

[0001] This application relates to the field of power control technology, and more specifically, to an adaptive limiting method, apparatus, and electronic device. Background Technology

[0002] In DC-DC voltage regulation systems, a dual closed-loop control architecture combining an outer voltage loop and an inner average current loop is commonly used. In digital control implementation, to avoid the outer voltage loop desaturating too slowly during load changes, which could lead to output voltage overshoot or steady-state deviation, a negative limiting constraint is usually applied to the inductor current setpoint of the outer voltage loop output.

[0003] However, the control method using a fixed negative limit value presents inherent technical contradictions in practical applications. When the negative limit value is set too small, the desaturation speed of the outer voltage loop is limited during the transition from heavy load to no-load conditions, easily leading to a large overshoot in the output voltage. Furthermore, during no-load steady-state operation, the actual output voltage may exceed the given value, resulting in a steady-state deviation. Conversely, when the negative limit value is set too large, the outer voltage loop is prone to deep negative saturation during the transition from no-load to sudden load conditions, causing a delay in the recovery of the inner current loop and a decrease in dynamic response performance. The inability to simultaneously achieve both steady-state accuracy and dynamic response performance across the entire operating range restricts the improvement of overall voltage regulation performance. Summary of the Invention

[0004] The problem addressed in this application is how to achieve voltage regulation performance under all operating conditions.

[0005] To address the aforementioned issues, this application provides an adaptive limiting method, apparatus, and electronic device.

[0006] Firstly, this application provides an adaptive clipping method, including: The voltage error is determined based on the voltage setpoint and voltage feedback value; The voltage error is compensated by a compensator to obtain a compensated output value; By using a limiter, the compensation output value is restricted to a preset range to obtain the limiting result; The limiting result is used as the lower limit of the output of the voltage outer loop controller.

[0007] Optionally, the ratio of the closed-loop response bandwidth of the compensator to the closed-loop bandwidth of the voltage outer loop controller is a first preset ratio.

[0008] Optionally, the voltage error is compensated by a compensator to obtain the compensated output value, including: By using pre-tuned proportional and integral coefficients, proportional-integral compensation is performed on the voltage error to obtain the compensated output value. The compensator includes a proportional-integral compensator.

[0009] Optionally, the tuning of the scaling factor includes: Set the initial value of the scaling factor to zero; Apply rated heavy load sudden unloading test conditions to the initial values; Increase the proportional coefficient by the first preset step size and monitor the transient waveform of the output voltage; When the voltage overshoot peak value is lower than the preset overshoot threshold and the oscillation amplitude during the output voltage regulation process is lower than the preset steady-state deviation threshold, the current proportional coefficient is used as the tuning result of the proportional coefficient.

[0010] Optionally, the tuning of the integral coefficients includes: Keeping the already tuned proportional coefficient unchanged, under the preset no-load steady-state test conditions, the initial value of the integral coefficient is set to zero; Increase the integral coefficient by the second preset step size; When the integral coefficient meets the integral coefficient tuning conditions, the current integral coefficient is taken as the tuning result of the integral coefficient. The integral coefficient tuning conditions include at least one of the following conditions: the absolute value of the steady-state voltage deviation is less than the preset steady-state deviation threshold, the time for the voltage to return to the preset steady-state deviation threshold is less than the preset recovery time, and the peak-to-peak fluctuation amplitude in the preset frequency band of the steady-state waveform is less than the preset low-frequency fluctuation threshold.

[0011] Optionally, the control frequency of the compensator is equal to the control frequency of the outer voltage loop controller; The operating frequency of the limiter is equal to the control frequency of the voltage outer loop controller.

[0012] Optionally, the preset range includes a preset maximum limit and a preset minimum limit; The ratio between the preset maximum limit and the rated output current is the second preset ratio. The ratio between the preset minimum limit and the rated current of the inductor is the third preset ratio.

[0013] Optionally, the adaptive limiting method also includes: At the initial moment, the output of the limiter is clamped to the preset minimum limit value.

[0014] Secondly, this application provides an adaptive limiting device, comprising: The error determination module is used to determine the voltage error based on the voltage setpoint and the voltage feedback value. The compensation module is used to compensate for voltage errors through a compensator to obtain a compensated output value. The limiting module is used to limit the compensation output value to a preset range through a limiter to obtain the limiting result; The output module is used to use the limiting result as the lower limit value of the voltage outer loop controller.

[0015] Thirdly, this application provides an electronic device, including a memory and a processor; Memory, used to store computer programs; A processor, used to implement the adaptive limiting method as described in the first aspect when executing a computer program.

[0016] The beneficial effects of the adaptive limiting method in this application are: Voltage error is determined by the voltage setpoint and voltage feedback value, used to characterize the voltage deviation trend in real time. A compensator compensates for the voltage error, obtaining a compensated output value used to generate a limiting boundary. This allows for independent adjustment of steady-state accuracy without affecting the main loop dynamics. The limiter restricts the compensated output value to a preset range, obtaining a limiting result. The upper limit prevents excessively negative current commands under no-load conditions, retaining a slight current drawdown capability and preventing positive steady-state deviation; the lower limit prevents continuous negative limiting lockout caused by integral saturation, avoiding controller output exceeding limits and resulting in control failure. The limiting result is used as the lower limit of the voltage outer loop controller's output, ensuring the main loop operates within the optimal limiting boundary across different load ranges, maintaining both rapid dynamic response and steady-state stability, achieving full-condition voltage regulation performance. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the adaptive clipping method according to an embodiment of this application; Figure 2 This is a control block diagram of the adaptive limiting method according to an embodiment of this application; Figure 3 This is an example diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of this application more apparent and understandable, specific embodiments of this application are described in detail below with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0019] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the description below. It should be noted that the concepts of "first," "second," etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "more" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] like Figure 1 and Figure 2 As shown in the embodiment of this application, an adaptive clipping method includes: Step S100: Determine the voltage error based on the voltage setpoint and voltage feedback value.

[0024] The voltage setpoint represents the target level that the converter output should maintain, which is set by the host computer instruction, internal reference source or external analog signal; the voltage feedback value represents the sampling result of the actual output level, which is obtained through voltage divider network, analog-to-digital conversion and digital filtering.

[0025] The voltage error obtained by subtracting the voltage setpoint and the voltage feedback value (e.g.) Figure 2 The voltage error (U_Error) is shown in the diagram. Its sign indicates the direction of the deviation, and its magnitude reflects the degree of deviation. When the voltage error is positive, it indicates that the actual output is lower than the target expectation, requiring an increase in the inductor current to boost the output. When the voltage error is negative, it indicates that the actual output is higher than the target expectation, requiring a decrease or reverse adjustment of the inductor current to suppress overvoltage. When the voltage error approaches zero, it indicates that the output has converged to near the target expectation, and the adjustment effect weakens accordingly. The voltage error serves as the driving signal for the outer voltage loop compensator and is used as the generation reference for the subsequent limiting stage.

[0026] In step S200, the voltage error is compensated by a compensator to obtain a compensated output value.

[0027] The compensator performs functions such as error integration, proportional amplification, and phase correction, converting voltage error into a compensated output value (e.g., ...). Figure 2 As shown in LimitCmpCout), when the voltage error persists, the compensator gradually accumulates its internal integral term, causing the compensation output value to change over time, thereby driving continuous adjustment of subsequent stages. When the voltage error changes rapidly, the proportional term responds instantly to suppress the impact of disturbances. The polarity of the compensation output value indicates the direction of adjustment, and the amplitude represents the adjustment strength.

[0028] The compensated output value serves as the input to the limiting circuit, and its range and rate of change determine whether to trigger the limiter's constraint boundary. Compared to directly feeding the voltage error into the limiter, processing it through the compensator before limiting allows the limiting decision to be based on the filtered and integrated adjustment requirements. The limiting threshold can be dynamically adjusted according to the actual intensity of the adjustment intention, which can suppress no-load steady-state deviation while also taking into account the transient response speed under heavy load, thus resolving the contradiction between steady-state performance and dynamic performance under fixed limiting parameters.

[0029] In step S300, the compensation output value is limited to a preset range by a limiter to obtain the limiting result.

[0030] The preset range is defined by an upper limit threshold (e.g.) Figure 2 The LimitDownMax and lower limit thresholds (as shown) are shown below. Figure 2 The LimitDownMin parameter is defined as follows, where the lower threshold is a dynamically adjustable negative boundary used to balance the desaturation rate of the outer voltage loop with the steady-state deviation. When the compensated output value is within the preset range, the limiting result is consistent with the compensated output value; when the compensated output value exceeds the upper threshold, the limiting result is clamped to the upper value to prevent excessive current from causing device overcurrent or core saturation, and to prevent output voltage runaway due to the normally open switching device; when the compensated output value is below the lower threshold, the limiting result is clamped to the lower threshold to avoid excessively reversed adjustment commands that could lead to deep negative saturation or recovery delay.

[0031] The limiter transforms the compensator's regulated output into a controlled, bounded output, ensuring that the subsequent inner current loop always receives a signal that meets the converter's load stability requirements. During no-load steady-state operation, the lower threshold is tightened to suppress excessively high output voltage; during sudden load increases, the lower threshold is widened to accelerate the recovery speed of the inner current loop. Thus, without altering the compensator's structure, the limiting boundary resolves the conflict between steady-state deviation and dynamic response, improving voltage regulation quality across the entire operating range.

[0032] Step S400: Use the limiting result as the lower limit of the voltage outer loop controller output.

[0033] The lower limit of the voltage outer loop controller output represents the negative constraint boundary applied to the internal integral or state variables of the voltage outer loop controller. This parameter directly affects the internal calculation process of the controller, limiting the reverse accumulation depth of the regulation from the source and preventing the controller from entering a deep saturation state that is difficult to exit quickly.

[0034] The limiting result (such as) Figure 2 The LimitLimOut shown is used as the lower limit value (e.g., Figure 2 The LimitDown indicator signifies that the controller's negative regulation capability is dynamically bound to a reasonable range permissible under the current operating conditions. When the load decreases from heavy to light and the output voltage tends to be higher, this lower limit automatically tightens, preventing excessive reverse accumulation of the controller's internal state, thus shortening the desaturation time, suppressing output voltage overshoot, and reducing no-load steady-state deviation. When the load suddenly increases from light to heavy and the output voltage drops sharply, this lower limit is correspondingly relaxed, allowing the controller's internal state to retain sufficient reverse regulation margin, avoiding slow recovery of the current inner loop and maintaining transient response speed. This lower limit changes in real time with the limiting result, and its value itself reflects the current demand and tolerance for negative regulation intensity.

[0035] This design internalizes the external limiting logic into the controller's own state constraint mechanism, ensuring that the adjustment behavior always unfolds within the controlled boundaries. Compared to applying a fixed clamp only at the controller output, embedding the dynamic limiting result into the controller as a lower limit value fundamentally eliminates the conditions for deep negative saturation, rather than passively waiting for exit after saturation occurs. Simultaneously, because this lower limit value is adaptively linked to the operating conditions, the controller exhibits differentiated negative adjustment characteristics at different operating stages. Without requiring manual parameter switching or additional judgment logic, it can coordinate steady-state convergence quality and dynamic recovery capability across the entire load range, resolving the inherent contradiction of mutual constraint between the two in traditional fixed limiting schemes.

[0036] In this embodiment, the voltage error is determined by the voltage setpoint and voltage feedback value, which is used to characterize the voltage deviation trend in real time. A compensator compensates for the voltage error, obtaining a compensated output value used to generate a limiting boundary. This allows for independent adjustment of steady-state accuracy without affecting the main loop dynamics. The limiting device restricts the compensated output value to a preset range, obtaining a limiting result. The upper limit prevents excessively negative current commands under no-load conditions, retaining a slight current absorption capacity and preventing positive steady-state deviation. The lower limit prevents continuous negative limiting lockout caused by integral saturation, avoiding controller output exceeding limits and resulting in control failure. The limiting result is used as the lower limit of the voltage outer loop controller's output, ensuring the main loop operates within the optimal limiting boundary in different load ranges. This maintains both rapid dynamic response and steady-state stability, achieving full-condition voltage regulation performance.

[0037] Optionally, the ratio of the closed-loop response bandwidth of the compensator to the closed-loop bandwidth of the voltage outer loop controller is a first preset ratio.

[0038] In one embodiment, the ratio of the closed-loop response bandwidth of the compensator to the closed-loop bandwidth of the voltage outer loop controller is set to a first preset ratio.

[0039] Optionally, the first preset ratio ranges from one-fifth to one-tenth, meaning the closed-loop response bandwidth of the compensator is designed to be between one-fifth and one-tenth of the closed-loop bandwidth of the voltage outer loop controller.

[0040] The compensator is used to generate the lower limit of the voltage outer loop controller's output based on the voltage error. By limiting the first preset ratio to a range that is lower than the adjustment speed of the voltage outer loop controller, bandwidth separation is achieved in the frequency domain. This prevents the dynamic processes of the compensator and the voltage outer loop controller from interacting in similar frequency bands, avoiding coupled oscillations caused by overlapping dual-loop frequencies.

[0041] In practical implementation, the actual closed-loop bandwidth of the voltage outer loop controller is first determined through experiments or simulations. Then, the target closed-loop bandwidth of the compensator is calculated by multiplying this bandwidth value by a first preset ratio. The proportional and integral coefficients of the compensator are tuned according to the target closed-loop bandwidth to ensure that its step response or frequency response meets the preset bandwidth requirements. During the tuning process, it is necessary to verify that the adjustment process of the lower limit of the voltage outer loop output is smooth under different load conditions and does not affect the stability and dynamic performance of the voltage outer loop controller itself.

[0042] Optionally, the voltage error is compensated by a compensator to obtain the compensated output value, including: By using pre-tuned proportional and integral coefficients, proportional-integral compensation is performed on the voltage error to obtain the compensated output value. The compensator includes a proportional-integral compensator.

[0043] In one embodiment, the compensator employs a proportional-integral (PI) compensator structure to perform proportional-integral operations on the voltage error to generate a compensated output value. The PI compensator includes pre-tuned proportional and integral coefficients, where the proportional coefficient determines the response strength to instantaneous changes in the voltage error, and the integral coefficient determines the ability to correct for accumulated voltage errors.

[0044] In practice, the real-time acquired voltage error is used as the input signal of the proportional-integral compensator. The proportional component multiplies the voltage error by a proportional coefficient to obtain the proportional component, reflecting the urgency of the current deviation. The integral component multiplies the voltage error by an integral coefficient and then accumulates the results to obtain the integral component, eliminating steady-state residual deviation. Adding the proportional and integral components yields the compensated output value, the magnitude and direction of which are determined by the dynamic characteristics of the voltage error and a preset coefficient.

[0045] In one embodiment, the PI compensator formula is expressed as: , Where u(k) represents the PI compensator, K p K represents the proportionality coefficient. i denoted by , e represents the voltage error, and T represents the sampling period, i.e., the control frequency.

[0046] Optionally, the tuning of the scaling factor includes: Set the initial value of the scaling factor to zero.

[0047] Apply rated heavy load sudden unloading test conditions to the initial values.

[0048] The output voltage transient waveform is monitored by increasing the proportional coefficient by the first preset step size.

[0049] When the voltage overshoot peak value is lower than the preset overshoot threshold and the oscillation amplitude during the output voltage regulation process is lower than the preset steady-state deviation threshold, the current proportional coefficient is used as the tuning result of the proportional coefficient.

[0050] In one embodiment, the proportional gain is tuned to determine the compensator's response to instantaneous changes in voltage error, ensuring that voltage overshoot and oscillations during regulation are within a preset range under heavy load unloading conditions. The tuning process uses rated heavy load unloading as the standard test condition, and obtains parameter values ​​that meet performance requirements by gradually adjusting the proportional gain and observing the transient response of the output voltage.

[0051] Specifically, the initial value of the proportional coefficient is set to zero, at which point the compensator only retains its integral function. After the power module operates stably under rated heavy load, a sudden unload operation is performed to simulate the extreme scenario of rapid load current drop in actual applications. Subsequently, the proportional coefficient is gradually increased by a first preset step size. The sudden unload test is repeated after each adjustment, and the transient waveform of the output voltage is recorded. The voltage overshoot peak value and the oscillation amplitude during the adjustment process are monitored. When, after a certain adjustment, the measured voltage overshoot peak value is lower than the preset overshoot threshold, and the oscillation amplitude of the output voltage during the recovery process is lower than the preset steady-state deviation threshold, it is determined that the current proportional coefficient has taken into account both the ability to suppress overshoot and maintain a smooth transition, and this is taken as the final tuning result.

[0052] Optionally, the tuning of the integral coefficients includes: Keeping the already tuned proportional coefficient unchanged, under the preset no-load steady-state test conditions, the initial value of the integral coefficient is set to zero.

[0053] The integral coefficient is increased by the second preset step size.

[0054] When the integral coefficient meets the integral coefficient tuning conditions, the current integral coefficient is taken as the tuning result of the integral coefficient. The integral coefficient tuning conditions include at least one of the following conditions: the absolute value of the steady-state voltage deviation is less than the preset steady-state deviation threshold, the time for the voltage to return to the preset steady-state deviation threshold is less than the preset recovery time, and the peak-to-peak fluctuation amplitude in the preset frequency band of the steady-state waveform is less than the preset low-frequency fluctuation threshold.

[0055] In one embodiment, the integral coefficient is tuned to determine the compensator's ability to correct accumulated voltage errors, ensuring that the steady-state voltage deviation, recovery time, and low-frequency fluctuations under no-load conditions all meet the requirements. The integral coefficient tuning process is carried out under the premise that the proportional coefficient is fixed, using a preset no-load steady-state condition as the standard test condition. By gradually adjusting the integral coefficient and observing the steady-state characteristics of the output voltage, parameter values ​​that meet the performance indicators are obtained.

[0056] Specifically, keeping the already tuned proportional coefficient unchanged, the initial value of the integral coefficient is set to zero, at which point the compensator only has a proportional response. With the power module in a stable no-load operating state, the integral coefficient is gradually increased in a second preset step size, and the steady-state waveform and related indicators of the output voltage are recorded after each adjustment. The absolute value of the steady-state voltage deviation, the time required for the voltage to return to the preset steady-state deviation threshold, and the peak-to-peak fluctuation amplitude within a preset frequency band in the steady-state waveform are monitored. When, after a certain adjustment, the integral coefficient meets at least one of the integral coefficient tuning conditions, it is determined that the current parameter has achieved the expected effect, and this is taken as the final tuning result. The integral coefficient tuning conditions include: the absolute value of the steady-state voltage deviation is less than the preset steady-state deviation threshold; the time for the voltage to return to the preset steady-state deviation threshold is less than the preset recovery time; and the peak-to-peak fluctuation amplitude within a preset frequency band in the steady-state waveform is less than the preset low-frequency fluctuation threshold. That is, the no-load steady-state voltage returns to the given value within an acceptable time.

[0057] Optionally, the control frequency of the compensator is equal to the control frequency of the outer voltage loop controller.

[0058] The operating frequency of the limiter is equal to the control frequency of the voltage outer loop controller.

[0059] In one embodiment, the control frequency of the compensator is set to the same value as the control frequency of the voltage outer loop controller, and the operating frequency of the limiter is kept consistent with the control frequency of the voltage outer loop controller. This frequency synchronization configuration ensures that the compensator, limiter, and voltage outer loop controller operate under the same time reference.

[0060] The compensator is used to dynamically correct voltage errors and output compensation values, while the control frequency is used to determine the update rate of voltage error sampling and calculation. Aligning the control frequency with the control frequency of the outer voltage loop controller allows the generation rhythm of the compensation output value to match the adjustment cycle of the outer voltage loop, thereby maintaining the phase consistency of the closed-loop response.

[0061] The limiter is used to apply boundary constraints to the output of the outer voltage loop controller, and its operating frequency is used to determine the timeliness of the limiter judgment and execution. When the limiter's operating frequency is equal to the outer voltage loop control frequency, a complete limiter process can be completed in each control cycle, ensuring that the limiter adjustment takes effect before the next adjustment command is generated.

[0062] Optionally, the preset range includes a preset maximum limit and a preset minimum limit.

[0063] The ratio between the preset maximum limit and the rated output current is the second preset ratio.

[0064] The ratio between the preset minimum limit and the rated current of the inductor is the third preset ratio.

[0065] In one embodiment, the preset range is determined by a preset maximum limit and a preset minimum limit, used to constrain the effective range of the compensator output and the amplitude limiting boundary adjustment. The values ​​at both ends of the preset range are set proportionally based on the current parameters, taking into account both no-load steady-state correction capability and negative integral saturation protection requirements.

[0066] The preset maximum limit is determined by multiplying the rated output current by a second preset ratio, and is a small negative value close to zero. For example, the second preset ratio ranges from 1% to 2%. For instance, when the rated output current is fifty amperes, the preset maximum limit can be set to -1 ampere. This is used to ensure that the outer voltage loop retains a slight current-absorbing regulation capability under no-load steady-state conditions, thereby continuously offsetting the positive voltage drift caused by the non-ideal characteristics of power devices and eliminating positive deviations in steady-state voltage. If this value is set to zero or a positive value, the compensator will lose its downward correction margin under light load or no-load conditions, resulting in a long-term high output voltage; if the negative value is too large, it may introduce unnecessary reverse regulation when no correction is needed, affecting light-load efficiency and stability.

[0067] The preset minimum limit is determined by multiplying the inductor's rated current by a third preset ratio. For example, the third preset ratio can range from 20% to 30%. For instance, when the inductor's rated current corresponds to a product's rated output of 50 amps, the preset minimum limit could be set to 10 amps. This is used to prevent the negative integral effect from accumulating and causing the limiting boundary to drop indefinitely, thus avoiding a situation where the negative limiting value cannot recover to the normal operating range. Under prolonged heavy loads or abnormal operating conditions, the integral term may drive the limiting boundary far below actual demand. Even after the load returns to normal, a long reverse integration is required to recover, resulting in a sluggish dynamic response. By setting a reasonable third preset ratio, sufficient negative adjustment margin is maintained to cope with transient drops, while limiting the depth of integral saturation, ensuring that the limiting boundary is always within a reasonable range that can be quickly recovered.

[0068] Optionally, the adaptive limiting method also includes: At the initial moment, the output of the limiter is clamped to the preset minimum limit value.

[0069] In one embodiment, the adaptive limiting method sets the output clamp value of the limiter to a preset minimum limit value at the initial moment, so as to provide a definite negative boundary constraint at the moment of power-on and prevent uncontrollable negative adjustment behavior when the compensator has not yet established an effective output.

[0070] During the initialization phase, the compensator output is reset to zero, while the limiter's internal state is set to a small negative value. At this time, the limiter's actual output is the preset maximum limit. This ensures that the outer voltage loop has a slight current-drawing capability in the initial startup phase. The compensator output returning to zero indicates that the dynamic correction term has not yet been engaged, and the preset maximum limit of the limiter output serves as the initial adjustment bias, providing a smooth transition basis for the voltage build-up process and avoiding startup overshoot or response lag caused by the compensator climbing from zero.

[0071] An adaptive limiting device provided in this application includes: The error determination module is used to determine the voltage error based on the voltage setpoint and the voltage feedback value.

[0072] The compensation module is used to compensate for voltage errors through a compensator to obtain a compensated output value.

[0073] The limiting module is used to limit the compensation output value to a preset range through a limiter to obtain the limiting result.

[0074] The output module is used to use the limiting result as the lower limit value of the voltage outer loop controller.

[0075] like Figure 3As shown in the embodiment of this application, an electronic device 300 includes a memory 310 and a processor 320; the memory 310 is used to store a computer program; the processor 320 is used to implement the above adaptive limiting method when the computer program is executed.

[0076] Alternatively, an electronic device 300 includes a memory 310 and a processor 320 coupled to the memory 310; the memory 310 is configured to store a computer program; the processor 320 is configured to perform the following operations when the computer program is executed: The voltage error is determined based on the voltage setpoint and the voltage feedback value.

[0077] The voltage error is compensated by the compensator to obtain the compensated output value.

[0078] By using a limiter, the compensation output value is restricted to a preset range to obtain the limiting result.

[0079] The limiting result is used as the lower limit of the output of the voltage outer loop controller.

[0080] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the adaptive limiting method described above.

[0081] Alternatively, a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the following operations: The voltage error is determined based on the voltage setpoint and the voltage feedback value.

[0082] The voltage error is compensated by the compensator to obtain the compensated output value.

[0083] By using a limiter, the compensation output value is restricted to a preset range to obtain the limiting result.

[0084] The limiting result is used as the lower limit of the output of the voltage outer loop controller.

[0085] Electronic device 300, which can serve as a server or client in this application, is described below as an example of hardware devices that can be applied to various aspects of this application. Electronic device 300 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 300 can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the application described and / or claimed herein.

[0086] Electronic device 300 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) or a computer program loaded from a storage unit into random access memory (RAM). The RAM may also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0087] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of this application according to actual needs. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or as software functional units.

[0088] Although the above disclosure is provided, the scope of protection of this application is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this application, and all such changes and modifications will fall within the scope of protection of this application.

Claims

1. A method of adaptive clipping, characterized by, include: The voltage error is determined based on the voltage setpoint and voltage feedback value; The voltage error is compensated by a compensator to obtain a compensated output value; By using a limiter, the compensation output value is restricted to a preset range to obtain a limiting result; The amplitude limiting result is used as the lower limit of the output of the voltage outer loop controller.

2. The method of claim 1, wherein, The ratio of the closed-loop response bandwidth of the compensator to the closed-loop bandwidth of the voltage outer loop controller is a first preset ratio.

3. The adaptive limiting method according to claim 1, characterized in that, The process of compensating for the voltage error using a compensator to obtain a compensated output value includes: The voltage error is proportionally and integrally compensated by pre-tuning the proportional coefficient and integral coefficient to obtain the compensated output value, wherein the compensator includes a proportional-integral compensator.

4. The adaptive limiting method according to claim 3, characterized in that, The tuning of the proportional coefficient includes: Set the initial value of the scaling factor to zero; Apply rated heavy load sudden unloading test conditions to the initial values; The proportional coefficient is increased by a first preset step size, and the transient waveform of the output voltage is monitored. When the voltage overshoot peak value is lower than the preset overshoot threshold and the oscillation amplitude during the output voltage regulation process is lower than the preset steady-state deviation threshold, the current proportional coefficient is used as the tuning result of the proportional coefficient.

5. The adaptive limiting method according to claim 3, characterized in that, The tuning of the integral coefficients includes: Keeping the already tuned proportional coefficient unchanged, under the preset no-load steady-state test conditions, the initial value of the integral coefficient is set to zero; The integral coefficient is increased by a second preset step size; When the integral coefficient meets the integral coefficient tuning conditions, the current integral coefficient is used as the tuning result of the integral coefficient. The integral coefficient tuning conditions include at least one of the following conditions: the absolute value of the steady-state voltage deviation is less than a preset steady-state deviation threshold, the time for the voltage to return to the preset steady-state deviation threshold is less than a preset recovery time, and the peak-to-peak fluctuation amplitude in the preset frequency band of the steady-state waveform is less than a preset low-frequency fluctuation threshold.

6. The adaptive limiting method according to claim 1, characterized in that, The control frequency of the compensator is equal to the control frequency of the voltage outer loop controller; The operating frequency of the limiter is equal to the control frequency of the voltage outer loop controller.

7. The adaptive limiting method according to claim 1, characterized in that, The preset range includes a preset maximum limit and a preset minimum limit; The ratio between the preset maximum limit and the rated output current is the second preset ratio. The ratio between the preset minimum limit and the rated current of the inductor is the third preset ratio.

8. The adaptive limiting method according to claim 1, characterized in that, Also includes: At the initial moment, the output of the limiter is clamped to a preset minimum limit value.

9. An adaptive limiting device, characterized in that, include: The error determination module is used to determine the voltage error based on the voltage setpoint and the voltage feedback value. The compensation module is used to compensate for the voltage error through a compensator to obtain a compensated output value; A limiting module is used to limit the compensation output value to a preset range through a limiter to obtain a limiting result; The output module is used to use the limiting result as the lower limit value of the output of the voltage outer loop controller.

10. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the adaptive limiting method as described in any one of claims 1-8 when executing the computer program.

Images